Paper tube and container



C. H. HOWARD.

PAPER TUBE AND CONTAINER. APPLICATION FILED AUG-12,1919.

Patented July 5, 1921.

lilliiiyllllllllllllllllllllllllllfllllllllllIlIllllllllll"mllllllllllllIlllllllllIllllllIllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllilllllluv-e12 -%or.- m am CHARLES H. HOWARD, OF SAUGUS, MASSACHUSETTS,ASSIGNOR TO PAPER PRODUCTS MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, ACORPORATION OF MASSA- CHUSETTS.

PAPER TUBE AND CONTAINER.

Specification of Letters Patent.

Patented July 5, 1921.

Application filedAugust 12, 1919. Serial No. 316,964.

San us, in the county of Essex and State of Iassachusetts, have inventedan Improvement in Paper Tubes and Containers, of which the followingdescription, in connection with the accompanying drawings, is aspecification, like characters on the drawings representing like parts.

This invention relates to paper tubes or containers, and moreparticularly to such tubes or containers that are waterproof.

I In making waterproof tubes or containers,

it has been heretofore suggested to employ a' waterproof adhesive foruniting two superposed pieces of fabric or paper, and then to secure theedges of the paper together to complete the container or tube.

Diiiiculty is experienced, however, in making waterproof tubes andcontainers, by the incorporation therewith of a waterproof adhesive,because, while the waterproof adhesive, such as asphaltum or other likecompound may have suflicient adhesive qualities to maintain the parts inproper relation under normal conditions, it. happens at times,especially where the container is subjected to unusual strain in thepresence of moisture, that the container may rupture alo'ng the line ofthe seam. On the other hand, non-waterproof adhesive, such as gums andthe like, have the requisite strength to secure the seams together, butlack the waterproof quality which is desirable.

To impart the desired strength to the tube or container to resistrupture in ord1nary use, it is desirable that the superposed layers ofpaper of which the container is preferably formed, may have associatedtherewith, threads, fibers and the like.

An important feature of the present invention, therefore, consists of apaper tube, which may itself form a container, or from which containers,such as bags, may be made, formed from a blank comprising the superposedlayers of paper of unequal size to produce a marginal portion of singleply, the two superposed paper plies being ad-- hesively secured togetherby awaterproof material, such as asphaltum or the like-, and themarginalsingle. ply beingprovided with .a non-waterproof adhesive.

Where the body strength of the container is of importance, it isdesirable to have the two paper plies reinforced by reinforcingfilaments, as hereinbefore noted, and the present invention in thisaspect provides for the incor oration with the waterproof adheslve wichconnects the two plies together, of a series of reinforcing filamentsembedded in the waterproof material. These reinforcing filaments mayextend trans. versely of the blank and also longitudinally thereof ifdesired, and where they extend transversely, the present inventioncontemplates that the uncovered portions of the relnforcing filamentswhich extend along the marginal flap, shall be adhesively securedbetween the single ply marginal flap and the body or two ply portion ofthe blank by a non-waterproof material, and to prevent moisture seekingits way into the non-waterproof adhesive, a marginal waterproof adhesiveis preferably employed along the overlapping edge of the two ply or bodyportion of the blank. By having the nonwaterproof adhesive applied tothe single ply or between it and the double ply when the parts areconnected together, the moisture which evaporates from the nonwaterproof adhesive, may pass through the single ply without obstructionby any overlying waterproofing material.

The blank from which the tube is made, may be formed of twolongitudinally extending strips of paper of unequal width, adhesivelyconnected together by a waterproof adhesive with one edge of each of thei the tube may be formed;

Fig. 2 representsa tube formed of the blank and having parts broken awayto disclose the construction beyond;

Fig. 3 is a, detail perspective showing more clearly the underlappingsingle .ply

having the non-waterproof connection with the overlying double ply, andthe waterproof adhesive applied to the edge of the double ply to protectthe non-waterproof material; and .2 Y

Fig. 4 represents a container in the form of a bag which may be producedby cutting the tube in sections and turning in one end, or both.

The blank is composed of a layer 1 of paper on which is superposedanother layer 2 which is narrower than the underlying layer, the twobeing adhesively connected together by a Waterproof material whichextends throughout the contact surfaces of the two paper strips orlayers. Owing to the difference in width of the layers 1 and 2, there isproduced along one longitudinal edge portion of the blank, a single plyof paper as at 3, its width being defined by the distance between theedge 4: of the narrow strip and the edge 5 of the wider strip.

The waterproof adhesive or asphaltum 1s omitted along the marginalsingle ply 3, and instead of such waterproof adhesive, this marginalsingle ply strip is provided with a non-waterproof adhesive or gum whichhas the desired adhesive tendency superior to that of the waterproofmaterial under certain conditions.

It is desirable to have the paper tube of sufficient body strength towithstand the internal strains to which it is subjected, and to this endthe present invention contemplates the reinforcement of the blank and ofthe completed tube by means of reinforcing filaments 6 which, asindicated in Fig. 2, may extend longitudinally and circumferentially ofthe tube when the blank is rolled into its tubular form. Thisdisposition of the reinforcing filaments 6 is represented at the brokenaway portion of the blank in Fig. 1.

The portion of the transversely extending filaments that project beyondthe edge 4 of the narrower strip, may not have the longitudinalreinforcing filaments associated therewith, and will be secured to thesingle ply marginal portion 3 by the non-waterproof material appliedthereto for connecting it to the, two ply waterproof portion of the bodywhen the blank is finally rolled into tubular form as indicated in Fig.2.

In order teform the tube from the blank indicated in Fig. 1, the blankis rolled about its longitudinal dimension into tubular form asindicated in Fig. 2, wherein it will be noted that the singleplymarginal portion 3 underlies the double ply or body portion of theblank, and as hereinbefore noted, the single ply marginal portion 3 willbe connected to the overlying two ply portion of the blank by anon-waterproof adhesive, which not only connects the single ply to thebody or double ply, but confines the filaments which are exposed alongthe single ply between the single ply andthe double neeaeoe I ply. Thiscondition of the final structure is indicated in Fig. 3.

"When the single ply 3 has been united to the overlying or doubleportion, a waterproofing matcrial 7 is applied along the edge of theoverlapping portion of the body where it extends beyond the edge 4: ofthe narrower strip of paper, to thereby protect the non-waterproofmaterial from the entrance of moisture along the edge of the overlappingdouble ply.

V hen it is desired to make a bag form of container as indicated in Fig.4, the tube A (Fig. 2) may be cut up into desired lengths, and then theends infolded as at 8 and overlapped by the infolded side portions 9, asuitable waterproof adhesive being employed on the flaps 8 and 9 topermanently secure them together.

What is claimed is 1. A paper tube formed from a blank which is composedof two superposed layers of paper secured together by a layer ofwaterproof adhesive, one of the layers of paper having a marginalportion longitudinally of the blank which is free from waterproofmaterial and which extends beyond the edge of the superposed layer ofpaper, a non-waterproof adhesive for securing said marginal single plyportion to the inner wall of the 'double ply portion of the blank toform the blank into a tube, and a waterproof adhesive securing thelongitudinal marginal portions of the double ply blank to each other inoverlapping engagement and in position to exclude atmosphere moisturefrom said non-waterproof adhesive.

2. A paper tube formed from a blank which is composed of two superposedlayers of paper secured together by a layer of waterproof adhesive. oneof the layers of paper having a marginal portion longitudinally of theblank which is free from waterproof material and which extends beyondthe edge of the superposed layer of paper, a non-waterproof adhesiveforsecuring said CHARLES H. HOWARD.

' marginal single ply portion to the inner wall

